Pine, IMAP, and SSH (SSH, The Secure Shell: The Definitive Gu...

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Pine, IMAP, and SSH (SSH, The Secure Shell: The Definitive Guide)of 8http://www.hn.edu.cn/book/NetWork/NetworkingBookshelf_2ndEd/ssh...8/3/2005 2:16 PM11.3.1.2. Making Pine use SSH instead of rshPine's rsh feature is controlled by three configuration variables in the ~/.pinerc file: rsh-path, rsh-command,and rsh-open-timeout. rsh-path stores the program name for opening a Unix remote shell connection.Normally it is the fully qualified path to the rsh executable (e.g., /usr/ucb/rsh). To make Pine use SSH,instruct it to use the ssh client rather than rsh, setting rsh-path to the location of the SSH client:rsh-path=/usr/local/bin/sshrsh-command represents the Unix command line for opening the remote shell connection: in this case, theIMAP connection to the IMAP host. The value is a printf-style format string with four "%s" conversionspecifications that are automatically filled in at runtime. From first to last, these four specifications stand for:1.2.3.4.The value of rsh-pathThe remote hostnameThe username for accessing your remote mailboxThe connection method; in this case, "imap"For example, the default value of rsh-commandis:"%s %s -l %s exec /etc/r%sd"which can instantiate to:/usr/ucb/rsh imap.example.com -l smith exec /etc/rimapdTo make this work properly with ssh, modify the default format string slightly, adding the -q option for quietmode:rsh-command="%s %s -q -l %s exec /etc/r%sd"This instantiates to:/usr/local/bin/ssh imap.example.com -w -l smith exec /etc/rimapdThe -q option is necessary so that ssh doesn't emit diagnostic messages that may confuse Pine, such as:Warning: Kerberos authentication disabled in SUID client.fwd connect from localhost to local port sshdfwd-2001Pine otherwise tries to interpret these as part of the IMAP protocol. The default IMAP server location of/etc/r %sd becomes /etc/rimapd.The third variable, rsh-open-timeout, sets the number of seconds for Pine to open the remote shellconnection. Leave this setting at its default value, 15, but any integer greater than or equal to 5 is permissible.So finally, the Pine configuration is:rsh-path=/usr/local/bin/sshrsh-command="%s %s -q -l %s exec /etc/r%sd"rsh-open-timeout=
Pine, IMAP, and SSH (SSH, The Secure Shell: The Definitive Guide)of 8http://www.hn.edu.cn/book/NetWork/NetworkingBookshelf_2ndEd/ssh...8/3/2005 2:16 PMRemote Usernames in PineBy the way, it's not mentioned in the Pine manpage or configuration file comments, but if youneed to specify a different username for connecting to a remote mailbox, the syntax is:{hostname/user=jane}mailboxThis causes Pine to call the rsh-command with "jane" as the remote username (i.e., the third%s substitution).Generally, you want to use an SSH authentication method that doesn't require typing a password orpassphrase, such as trusted-host or public-key with an agent. SSH is run behind the scenes by Pine anddoesn't have access to the terminal to prompt you. If you're running the X Window System, ssh can pop upan X widget instead to get input, ssh-askpass, but you probably don't want that either. Pine may makeseveral separate IMAP connections in the course of reading your mail, even if it's all on the same server. Thisis just how the IMAP protocol works.With the previous settings in your ~/.pinerc file and the right kind of SSH authentication in place, you'reready to try Pine over SSH. Just start Pine and open your remote mailbox; if all goes well, it will openwithout prompting for a password.
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Pine, IMAP, and SSH (SSH, The Secure Shell: The Definitive Gu...

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